Question

Is the sum of the first 20 terms of the arithmetic sequence 10,14,18,22...became 2021 why​

Answer 1

Answer:

the sequence continues with the +4 at every stage , d=4 ,a =10

formula = a20 =a+(20-1)4

=10 +(19)*4

=86 is the last term

if you find all twenty terms then add together it will gives you another ans so please check your question

Step-by-step explanation:

formula = n/2[2a+(n-1)d]

20/2 [2*10+(20-1)4]

this also giving the another ans so there is mistake in the question