Question

find the sum of the following APs:
2,7,12,...,to 10 terms​

Answer 1

Answer:

245

Step-by-step explanation:

n/2(2a+(n-1)d)

5(4+9×5)

5×49=245

Answer 2

Answer:

a1=2

a2=7

a3=12

a=a1=2

d=a2-a1

=7-2

=5

n=10

sn=n/2(2a+(n-1)d)

s10=10/2(4+(10-1)5)

=5(4+9*5)

=5(4+45)

=5(49)

=245.

so the sum is 245.