Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 Mathematics Relations and Functions

निम्नलिखित में से कौन सा संबंध, A = {a, b, c} से B = {a, b, c, d} का एक फलन है?

1
{(a, b), (b, c), (c, d), (b, b)}
2
{(b, b), (c, c), (a, a), (d, d)}
3
{(a, b), (b, c)}
4
{(a, a), (b, c), (c, d)}
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