Question

find the missing term in each of the following series : 1,6,15,?,45,66,91​

Answer 1

• 1 x 1=1.
• 2 x (1+2)=6,
• 3 x (3+2)=15
• 4 x (5+2)=28 that is answer,
• 5 x (7+2)=45,
• 6 x (9+2)=66,
• 7 x (11+2)=91

28 is ur answer

Explanation:

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