Question

(1) + (1+2) + (1+2+3)+.…​

Answer 1

Answer:

10

Step-by-step explanation:

1 + (1+2) + (1+2+3)

1 + (3)     + (3+3)

1 +  3       + 6

4 + 6 = 10

Answer 2

Answer:

ATQ,

(1)+(1+2)+(1+2+3)+ ?

(1)+(1+2)+(1+2+3)+(1+2)+(1)

Step-by-step explanation:

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