Question

If a=6 and d=10,
Then find S10=?.​

Answer 1

Answer:

The answer will be 510.

Step-by-step explanation:

Given;

a = 6;

d = 10;

Sn = (n/2)(a + al);

here, Sn = Sum of nth terms.

n = no. of terms.

al = last term.

Thus, al = a10

and, a10 = a + d(n-1);

= 6 + 10(10 -1);

= 6 + 90;

= 96;

Hence, S10 = (10/2)(6 + 96)

= 5(102);

= 510.

That's all.

Answer 2

Answer:

510

Step-by-step explanation:

S10=10/2[2(6)+9(10)]

=5[12+90]

=5(102)

510