How do you complete the pattern with the next two numbers. 10, 15, 21, 28,?

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Answer 1 · 2016-10-27T22:06:01

The pattern seems to be $a_n=a_(n-1)+n$ , with $a_4 =10$ as the first term

According to the formula above:

$a_4 =10$

$a_5=a_4+5=10+5=15$

$a_6=a_5+6=15+6=21$

$a_7=a_6+7=21+7=28$

So the next two numbers are:

$a_8=a_7+8=28+8=36$

$a_9=a_8+9=36+9=45$