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ପରବର୍ତ୍ତୀ ସଂଖ୍ୟାଟି ନିର୍ଣ୍ଣୟ କରନ୍ତୁ: 2, 6, 12, 20, 30, ?

A40
B36
C42
D44
Answer & Solution
Correct answer: C. 42
**ପାର୍ଥକ୍ୟ:** 4, 6, 8, 10 (2 ଲେଖାଏଁ ବୃଦ୍ଧି ପାଉଛି)। ପରବର୍ତ୍ତୀ ପାର୍ଥକ୍ୟ = 12। ତେଣୁ 30 + 12 = 42। ସମତୁଲ୍ୟ: n=1,2,3,... ପାଇଁ n(n+1) ଯାହା 2, 6, 12, 20, 30, 42 ପ୍ରଦାନ କରେ।
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