Question

(2) Find the sums indicated
7 + 12 + 17 + 22 + ..... + 101
​

Answer 1

Answer:

1089

Step-by-step explanation:

first term(@)=7

common difference (#)=12-7=5

the given series in AP

so 102=@+($-1)#

102=7+5$-5

100=5$

$=20

sum+1=20/2(14+19×5)

sum =10×109-1

sum=1090-1

sum=1089

Answer 2

Answer:137

Step-by-step explanation:     7+12=19   19+17=36     36+101=137