The number of identical terms between the two series `6,11,16,....50` terms and the series `13,15,17` upto `60` terms is

The number of identical terms between the two series " "6,11,16,....(50 terms) and the series " "13,15,17,.. "60" " terms is

The number of terms in arithmetics series 7, 11, 15,...,139 is

Sum of the series 1+3+7+15+....... upto n terms.

sum on n terms of the series 3,7,11,15,...... is

The sum of the first 20 terms common between the series 3+7+11+15+....1+6+11+16+.... and is

Find the number of term in the series 8,12,16,…..,72.

The sum of the first 16 terms common between the series 3 +7+11+15+... and 1+6+11 +16+... is

Find the sum of n term of the series 2+4+7+11+16+.....