Question

Q. 4
for An Ap. , a: 10 and b=3 then find
S15. (complete the following activity and
choose the correct option the empty box)​

Answer 1

Answer:

i) d

ii) 62

iii) 465

Step-by-step explanation:

i) the formula for finding Sñ= n/2 (2a + (n-1)d)

ii) 20+14×3= 20+ 42=62

iii) 15/2 × 62=930/2= 465