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On the World Environment Day tree planta...

On the World Environment Day tree plantation programme was arranged on a land which is triangular in shape. Trees are planted such that in the first row there is one tree, in the second row there are two trees, in the third row there are three trees and so on. Then find the total number of trees in `25` rows.

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CHETANA PUBLICATION-Arithmetic Progression-EXERCISE
  1. On the World Environment Day tree plantation programme was arranged on...

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  2. The sequence -10,-6,-2,2,….. a)is an A.P, Reason d=-16 b)is an A.P, Re...

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  3. First four terms of an A.P are…………, whose first term is -2 and common ...

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  4. What is the sum of first 30 natural numbers? a)464 b)465 c)462 d)461

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  5. For a given A.P., t7=4, d=-4 then a=……… a)6 b)-7 c)20 d)28

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  6. For a given AP, a=3.5, d=0, n=101 then tn=………. a)0 b)103.5 c)104.5 d)...

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  7. In an A.P, first two terms are -3, 4, then 21st term is……….a)-143 b)14...

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  8. If for an A.P, d=5 then t18-t13=……………a)5 b)20 c)25 d30

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  9. Sum of first five multiples of 3 is……a)45 b)15 c)55 d)35

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  10. 15, 10, 5,…… In this A.P the sum of first 10 terms is…..a)-75 b)-125 c...

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  11. In an A.P, 1st term is 1 and the last term is 20.The sum of all terms ...

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  12. For the A.P: 4,9,14…… t11=…..a)49 b)54 c)59 d)44

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  13. If a=6, d=3, then S10=……a)192 b)195 c)198 d)201

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  14. The sum of first 10 natural numbers is ..... a)55 b)155 c)310 d)210

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  15. Which of the following sequence is not an A.P? a)0.5,2,3.5,5,…. b)3,5,...

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  16. Find the missing term in the A.P: -5, ...., 13 a)1 b)4 c)2 d)3

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  17. Find the t2 of the sequence for which S1=2,S2=12 and S3=30 a)24 b)1 c)...

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  18. For an A.P if t4=12 and d=-10, then find a. a)-18 b)42 c)-5 d)21

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  19. The next two terms of the given sequence 1,3,7,15,31….. are: a)42, 54 ...

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  20. In an A.P, a=8, tn=62, Sn=210, then find n. a)5 b)6 c)7 d)8

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  21. The sum of first n terms of an A.P. is Sn=………… a)n/2[t1+tn] b)n/2[2+(n...

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