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`1-3+5-7+9-...20` पदों तक।

What is the sum of 1 1/2+4 1/6+7 1/12+10 1/20 .....up to 20 terms? 1 1/2+4 1/6+7 1/12+10 1/2 .....के 20 पदों तक का योग क्या है?

1.3.5.7+3.5.7.9+...

If A= 1/(1xx2)+1/(1xx4)+1/(2xx3)+1/(4xx7)+ 1/(3xx4)+1/(7xx10) ...... upto 20 terms, then what is the value of A? यदि 1/(1xx2)+1/(1xx4)+1/(2xx3)+1/(4xx7)+ 1/(3xx4)+1/(7xx10).....20 पदों तक हो, तो A का मान क्या है?

1.3.5.7+3.5.7.9+.....

What is the sum of first 40 terms of 1+3+4+5+7+7+10+9+ ...? 1+3+4+5+7+7+10+9+ ....के प्रथम 40 पदों का योग क्या है?

What is the value of 1/0.2+1/0.02+1/0.002 .....up to 9 terms? 1/0.2+1/0.02+1/0.002 .....9 पदों तक का मान क्या हे?

In following series find 20th number. 9, 5, 1, -3, -7, -11, ........

(ii) 3/20 ÷ 9/7

If A = {0, 1, 2, 3, 5,6}, B = {1,3, 5, 7, 9} and C = {0, 5, 10, 20,40}, find

Show that (3.5)/(5.10) + (3.5.7)/(5.10.15) + (3.5.7.9)/(5.10.15.20)+ …..oo = (5sqrt5)/(3 sqrt3) - 8/5