Question

find the sum of series 3 + 7 + 11 ..... up to 10 terms.​

Answer 1

Step-by-step explanation:

here a= 3

and a+d= 7

then d= 4

n=10

sum of n terms = n/2[2a+(n-1)d]

= 10 /2[ 2(3) + (10-1)4]

=5[6+36]

= 5×42

= 210

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Answer 2

Answer:

sum of n terms = 210

Step-by-step explanation:

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